I did some tests with retry, based on latest mainline kernel today

1. change retry to 10
2. install kernel and reboot/poweroff
3. on the first boot after install, regarding of reboot or poweroff, the patch 
works
4. after second boot (reboot or poweroff), it always fails

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https://bugs.launchpad.net/bugs/1917203

Title:
  AMD-Vi: Unable to read/write to IOMMU perf counter

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